Hint: Mariah Carey's "All I Want for Christmas is You" uses it. For more about the secret chord, read more from Adam Ragusea here: http://www.slate.com/articles/arts/music_box/2014/12/mariah_carey_s_all_i_want_for_christmas_is_you_a_musicological_explanation.html Subscribe to our channel! http://goo.gl/0bsAjO Vox.com is a news website that helps you cut through the noise and understand what's really driving the events in the headlines. Check out http://www.vox.com to get up to speed on everything from Kurdistan to the Kim Kardashian app. Check out our full video catalog: http://goo.gl/IZONyE Follow Vox on Twitter: http://goo.gl/XFrZ5H Or on Facebook: http://goo.gl/U2g06o

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